XL4015降压型直流电源变换器芯片(大功率型)

n LCD Monitor and LCD TV

n Portable instrument power supply n Telecom / Networking Equipment

component count.

Figure1. Package Type of XL4015

Pin Configurations

Figure2. Pin Configuration of XL4015 (Top View)

Table 1 Pin Description

Pin Number

Pin Name Description

1

GND

Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL4015.

2 FB Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.25V .

3 SW Power Switch Output Pin (SW). SW is the switch node that supplies power to the output.

4 VC Internal V oltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN.

5 VIN

Supply V oltage Input Pin. XL4015 operates from a 8V to 36V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.

Function Block

Figure3. Function Block Diagram of XL4015

Typical Application Circuit

Figure4. XL4015 Typical Application Circuit (VIN=8V~36V, VOUT=5V/5A)

Order Information Marking ID Package Type Packing Type Supplied As

XL4015E1 XL4015E1 TO263-5L 800 Units on Tape & Reel XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.

Absolute Maximum Ratings（Note1）

Parameter Symbol Value Unit Input Voltage Vin -0.3 to 40 V Feedback Pin Voltage V FB-0.3 to Vin V Output Switch Pin Voltage V Output-0.3 to Vin V Power Dissipation P D Internally limited mW Thermal Resistance (TO263-5L)

R JA30 ºC/W (Junction to Ambient, No Heatsink, Free Air)

Operating Junction Temperature T J-40 to 125 ºC Storage Temperature T STG-65 to 150 ºC Lead Temperature (Soldering, 10 sec) T LEAD260 ºC ESD (HBM) >2000 V Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

XL4015 Electrical Characteristics

T a = 25℃;unless otherwise specified.

Symbol Parameter Test Condition Min. Typ. Max. Unit System parameters test circuit figure4

VFB Feedback

V oltage

Vin = 8V to 40V, V out=5V

Iload=0.5A to 5A

1.225 1.25 1.275 V

Efficiency ŋVin=12V ,V out=5V

Iout=5A

- 87 - %

Efficiency ŋVin=24V ,V out=12V

Iout=4A

- 93 - %

Electrical Characteristics (DC Parameters)

Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, T a = 25℃; the others floating unless otherwise specified.

Parameters Symbol Test Condition Min. Typ. Max. Unit Input operation voltage Vin 8 36 V Quiescent Supply Current I q V FB =Vin 2.1 5 mA Oscillator Frequency Fosc 144 180 216 KHz Output Short Frequency Fosp 48 KHz Switch Current Limit I L V FB =0 7 A Max. Duty Cycle D MAX V FB=0V 100 %

Output Power PMOS Rdson V FB=0V, Vin=12V,

I SW=5A

60 80 mohm